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(No Model.) 2 Sheets-Sheet l.

J. H. GERRY.

ELECTRIC STRIKING ATTACHMENT FOR CLOCKS. No. 393,637. Patented Nov. 27,1888.

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(No Model.) 2 Sheets-Sheet 2.

J. H. GERRY. ELECTRIC STRTKINC ATTACHMENT TCR CLOCKS.

180.893.687. Patented Nov. 27, 1888.

544mm. @Lw/Ww, e I

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UNITED STATES PATENT Ormea.

JAMES H. GERRY, OF BROOKLYN, NE\V YORK, ASSIGNOE TO THE SELF VINDINGCLOCK COMPANY, OE SAME PLACE.

ELECTRIC STRI'KlNG ATTACHMENT FOR CLOCKS.

SPECIFICATION forming part of Letters Patent No.393,637, dated November27, 1888.

Application filed June l. ISES. Serial No.275,7-lll. (No model.)

.To @ZZ whom may concern:

Be it known that I, JAMES H. GERRY, a citizen of theUnitedStates,residing in Brooklyn, in the county of Kings, in the State of NewYork, have invented certain new and useful Improvements in ElectricalStriking Attachments for Clocks, ol' which the following is aspecification.

The invention relates to the construction of ro striking devicesdesigned to be operated through the instrumentality of electro-mag-`netism.

The invention consists, in general terms, in applying to a clockmechanism constructed with anysuitable form of driving-train a strikingdevice which will be operated at the proper intervals to give thenecessary strokes for indicating the hour, or fractions of an houril`desired, the power heilig supplied by means 2o of currents derived froma suitable source ol' electricity.

The invention will be described in conneo tion with the accompanying`drawings, in which Figure lis a plan of such parts ofthestriking-movement and applied mechanism as will serve to illustrate theinvention. Eig. 2 is a front view of certain portions of the mechanism.Fig. 3 is a rear view ofthe mechanism, 3o and Fie'. :L is a sideelevation. Only such portions ol' the clock mechanism are shown as arenecessary to the complete understanding ol' the invention.

In the drawings, A and A'l represent the front and back plates,respectively, ot the clock mechanism.

a and a represent the minute and hour hands, respectively,which aremounted in the usual manner. The strike-snail B surrounds lo the centralpost and is revolved in the usual manner.` The ratchet b is constructedwith a rackarm, Zz', applied to the snail in a manner well understood,aud to this ratchet there is applied the retaining-dog ZXl and thegathering-pin c, carried upon the revolving disk O. A spring is carriedin a drum, D, for driving the striking mechanism, and thus actuating thehammer H. This spring is designed to be wound by means of anelectro-magnet, E, and 5o itsarmaturcc. Thecircuit-connection throughthis electromagnet is controlled in the following manner: A conductor,L, is supposed to lead from a suitable source of currents to the clock,A conductor, l, leads from this through the coils ofthe magnet E to aninsulated contact-spring, f. A circuit-closing spring, f2,

is applied thereto, and this spring is connected by a conductor, 2, withthe returucon ductor L. The springf'l rests upon the periphery of thedisk O, and is normally held 6o away from the arm f. The disk O isconstructed with notches or indentations c', and

as these pass beneath the end of the springf" the latter is allowed tofall into contact with the arm j",thereby completing thecircuiteconnections. As shown in the drawings, the circuit will be thuscompleted three times during each revolution of the disk C; but thisnumber may he varied as foundA to be desirable.

The armature c, applied to the electro-mag net E, is suspended by arms cand in such manner that it will swing toward and gradually approach thepoles of the magnet when the latter is vitalized. A suitable spring, e,tends to hold the armature away from the poles ofthe magnet. Thevibrations of the armature thus obtained are communicated through apawl, It', to a wheel, K. This wheel meshes with a wheel, 7s', which iscarried upon 8o the drum D,and thus serves to wind the spring containedwithin the drum in a wellknown manner. It will therefore be seen thatthe spring within the drum D is maintained at the same tension, as theaction of the striking mechanism itself sends regular impulses throughthe electro-magnet E, operating the armature c and rewinding the spring.The inner end ofthe spring being attached to the arbor d, which arboralso carries the striking- 9o wheel M, the latter will be turnedwhenever it is released by reason ol the tension exerted by the spring.The movements of the striking-wheel Mare determined in the usualwellknown manner,and itis arrested at the proper point by means of thearm m moving with the retaining-dog b2, and engaging a pin, m', upon thewheel N of the striking-train. The other portions of the strikingmechanism which are shown in the drawings are well un- Ioo dei-stood,and need not here be more fully described.

In practice it has been found convenient to apply the striking devicehere described to a self-Winding clock of the character described in thepatent issued to Chester H. Pond, November 25, 1884, No. 308,521. In thediagram, Fig. 2, the winding apparatus of such a clock is represented atRand, as it Will be seen,the circuit through the electro-magnet Eisashunt upon the winding device R. Other circuitconnections, however, maybe adopted.

I claim as my invention- 1. An electricstriking device for clocks,consisting of a hammer-stroke*controlling mechanism, a spring foractuating the striking mechanism, and an electro magnet for winding thespring.

2. An electric striking device for elocks,eon sisting of ahammerstrokecontrolling meehanism, a spring for actuating the hammer andmechanism, and an electro magnet for Winding the spring, the armatureofsueh electromagnet having a'lateral movement with reference to thepoles thereof.

3. An electric striking device for clocks, eonsisting of ahammer-stroke-controlling mechanism, a spring for actuating the hammerand mechanism, an electro-magnet for winding the spring, and acircuit-controller operated by the striking mechanism for determiningthe connections through the electro-magnet.

4. An electric striking device for clocks,eon sisting of a hammer-stroke-eontrolling mechanism, a spring for actuating the hammer andmechanism, an electromagnet for Winding the spring-,and acircuit-controller for completing the connections through theelectro-magnet, consisting ofa disk carrying the gatheringpin, havingone or more indentations or projections, a circuit-closing arm restingagainst the disk, and a contact-arm applied thereto.

5. In a striking attachment for clocks, an electro-magnet for windingthe same, a gathering-pawl, and a circuit controller for completing theconnections through the electromagnet operated by the gatl'iering-pawl,substantially as described.

In testimony whereof I have hereunto subscribed my name this 31st day ofMay, A. D. ISSS.

JAMES H. GERRY.

IViunesses;

DANI.. W. EDGECOMB, CHARLES A. TERRY.

